add valgrind option to Makefile
Merge pull request #58 from mehlis/vg-makefile

add valgrind option to Makefile
removed useless Makefile complexity
added useful compiler switches
Merge pull request #59 from mehlis/ccn-lite-follow-up

Makefiles: ccn lite follow up
add licenses to my code
Merge pull request #60 from mehlis/license

add licenses to my code
Implement 6LoWPAN plugtests